What are the ancient four-word words to describe plum petals?

Dark fragrance and thin shadow-the original shape contains the fragrance and posture of plum blossom, and later it is used as a synonym for plum blossom.

Three friends in cold years-pine and bamboo never wither in winter, and plum blossoms are cold-resistant and open, so they are called "three friends in cold years".

Send plum blossoms-ask the postman to send plum blossoms. Metaphor is to express your thoughts to friends far away. Post plum blossom-the same as "post plum blossom".